<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Window方法测试</title>
</head>
<body>
    
    <script>
        //setInterval(周期性执行),setTimeout(定时执行)

        let message={};
        message.a={
            "00":1,
            "11":2,
        }

        console.log(message.a["00"]);
        
        let obankingData={a:1} && {b:2};
        console.log(obankingData);
         
        let a = 1 && 5;
        console.log(a);
        
        document.write("hello world")

    </script>
</body>
</html>